For local storage, an alternative to the Synology that others have mentioned is UnRAID. * Consolidate your drives to empty the largest ones you can. Or, buy th

For local storage, an alternative to the Synology that others have mentioned is UnRAID. * Consolidate your drives to empty the largest ones you can. Or, buy three 20TB drives (two for data, one for parity). * Buy/build a small server, install UnRAID on it, and create an array. If using new drives, you will have 40TB available. * Copy each old drive's data to the array. Retain the old drives as backup. * Once done, a) set up remote backup, and b) build a second, identical UnRAID server as another backup. Or the tape backup also suggested.