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I'm pretty happy with Arq [0]. It lets you choose from a few different backends [1]. I personally started with Glacier because this is only in addition to my on

I'm pretty happy with Arq [0]. It lets you choose from a few different backends [1]. I personally started with Glacier because this is only in addition to my on-site backup, so the 4 hour delay would only be relevant in the case of a house fire--at which point I'd just be happy to have the data at all. However, a four hour restore time (for me) meant I rarely tested the backups on a practical level--since four hours is a long time. It also invalidates some use cases. For example, I'd be at work and want to restore a file I deleted yesterday. My on-site backups (at home) aren't available and it'll take four hours to get that file from Glacier. If that's the case, I'd rather just have it on S3. So I did S3 for a while, but Google Nearline ended up being cheaper, so I switched to that. Arq supports all of them so it wasn't a big deal. Now I get a bill every month from Google for around $3.62, and can restore files nearly instantly if I need them. It does do incremental backups, although I think it's on the file level. I don't think it's "smart" enough to only upload the changed parts of a large VM snapshot, for example. I just don't have it back up my VMs because mine are all reproducible anyway. This thread is the first I'm hearing of Borg, so that looks neat. No experience with it, though. [0] https://www.arqbackup.com/ https://www.arqbackup.com/ [1] http://i.imgur.com/Le3bGMb.png http://i.imgur.com/Le3bGMb.png

brandon272 10y ago
My #1 concern with Arq is the integrity of backup data. This usually hasn't been an issue with using SFTP, S3 or Glacier as a backup destination but uploading to OneDrive or Amazon Cloud Drive usually ends up with a lot of backup errors. The errors seem to be entirely the fault of OneDrive or ACD but it leaves me wondering what files are backed up (apparently Arq doesn't re-try backing up whichever files were affected until the next backup session), and what the integrity is of files that do exist at the destination. I'm also unclear on whether any checksum validation is done by Arq (or even can be done) on uploaded files.
- moduspwnens14 10y ago
  I've never used OneDrive or Amazon Cloud Drive, so I've not seen that. Arq does have a button for validating data manually and a separate option for each backup destination that specifies how often (in days) backups should be validated. Whether that's a checksum or not, I don't know.
  - sreitshamer 10y ago
    It recalculates checksums of your files and compares them to checksums of the backup data at the destination. (I work on Arq)
- sreitshamer 10y ago
  Arq does validate checksums of the backup data. If there are transient errors it should be retrying. Please send mail to support@arqbackup.com so we can diagnose the problem and fix it. (I work for Arq)

brandon272 10y ago

My #1 concern with Arq is the integrity of backup data. This usually hasn't been an issue with using SFTP, S3 or Glacier as a backup destination but uploading to OneDrive or Amazon Cloud Drive usually ends up with a lot of backup errors. The errors seem to be entirely the fault of OneDrive or ACD but it leaves me wondering what files are backed up (apparently Arq doesn't re-try backing up whichever files were affected until the next backup session), and what the integrity is of files that do exist at the destination. I'm also unclear on whether any checksum validation is done by Arq (or even can be done) on uploaded files.

moduspwnens14 10y ago
I've never used OneDrive or Amazon Cloud Drive, so I've not seen that. Arq does have a button for validating data manually and a separate option for each backup destination that specifies how often (in days) backups should be validated. Whether that's a checksum or not, I don't know.
- sreitshamer 10y ago
  It recalculates checksums of your files and compares them to checksums of the backup data at the destination. (I work on Arq)
sreitshamer 10y ago
Arq does validate checksums of the backup data. If there are transient errors it should be retrying. Please send mail to support@arqbackup.com so we can diagnose the problem and fix it. (I work for Arq)