1) Yes. The format and encryption specifics are even documented: https://www.arqbackup.com/arq_data_format.txt https://www.arqbackup.com/arq_data_format.txt 2)

1) Yes. The format and encryption specifics are even documented: https://www.arqbackup.com/arq_data_format.txt https://www.arqbackup.com/arq_data_format.txt 2) Yes. Although if you're after cheap space, Hetzner's storage boxes are the cheapest $/GB I've seen (https://www.hetzner.de/hosting/produktmatrix/storagebox-produktmatrix https://www.hetzner.de/hosting/produktmatrix/storagebox-prod...), with Backblaze B2 close behind.