like an update to the currently existing backup data?
You can do that, though if you update the current backup and you overwrite it you might want to look at something like
rsync. That compares your current data with the backup and only transfers the changes.
Incremental backups on the other hand usually do not change the backup data. They add a file with the differences.
These are slight but important differences.
- A single up to date backup will be the same size as your data.
- A single full (first incremental) backup with only incrementals added afterward will grow in size. Every months change will be added. Month after month.
Depending on how much data you backups this may or may not be a problem.
Then there is a question where do you store the backups. You did not ask it, but you want to consider it. A backup on a drive in the same computer can be useful, but if lightning strikes (or theft, or fire, or ...) then you loose both the main data and the backup.
Therefor when selecting you backup solution, consider at least these additional points:
- How much space and time to I need for a backup?
- Where do I store the backups.
- Can I encrypt the backups (in case of theft, or off-site storage) and where do I store the encryption key?
(This started as a comment but I can't fit in in the bloody small comment fields).