I have a an external harddrive that I want to use as a backup for my 2big NAS, 4TB. However I do not fully get the backup options.
1. Either I can have a full backup of everything everytime I do a backup. This option would suit me great. However, what happens when the external harddrive gets full after a few backups? Will the NAS delete the oldest backup. I don't get this.
2. Automatic option. Really weird this one. It only copies the files i have modified. BUT it also keeps the old files. What happens when the external drive gets full.
Please enlighten me. I just want a "mirror" of my NAS on a external harddrive, which keeps itself updated, for example once a week or something. But the external drive will get full very fast, if old backups automatically won't be deleted.
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