People have mentioned incremental backups. This is critical, and not only for ransomware!
Likewise, it is critical to also have off-site backups — otherwise, if your building suffers a disaster (fire, theft, earthquake, …) that destroys all of your data including all of your backups, you'll lose everything!
For on-site backups, I use rdiff-backup, which can be tailored to keep incremental backups for as long as you want. (You might know of an easier package than rdiff-backup.) These backups are important for easy access. Storing your backups on at least three different physical media is excellent practice. Of course, all of the media devices should be fully encrypted!
For off-site incremental backups, I use an online service. (I use SpiderOakONE because it's multi-platform and affordable, but I'm sure that there are other providers.)
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People have mentioned incremental backups. This is critical, and not only for ransomware!
Likewise, it is critical to also have off-site backups — otherwise, if your building suffers a disaster (fire, theft, earthquake, …) that destroys all of your data including all of your backups, you'll lose everything!
For on-site backups, I use rdiff-backup, which can be tailored to keep incremental backups for as long as you want. (You might know of an easier package than rdiff-backup.) These backups are important for easy access. Storing your backups on at least three different physical media is excellent practice. Of course, all of the media devices should be fully encrypted!
For off-site incremental backups, I use an online service. (I use SpiderOakONE because it's multi-platform and affordable, but I'm sure that there are other providers.)