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Backup software recommendation?
(beehaw.org)
If it's free and open source and it's also software, it can be discussed here. Subcommunity of Technology.
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I am very happy using duply, that uses duplicity. Works well both for mounted disks or S3.
I would ignore any recommendations of a sync tool like Dropbox. They will very happy propagate your problem in all your places before you realized it.