You’re never really sure whether or not your data is safe unless you’re backing it up multiple times. The computer backup rule-of-thumb is three – your magic number to ensure that your data will really last. Known as the Backup 3-2-1 rule, saving your data in repeatedly can safe you a lot of trouble in the future.
Using one type of back up (i.e. SD card backup or external hard drive) is not really a backup because you need both off-site backup (i.e. Cloud services) and physical. Backups to different types of media are also recommended and multiple copies of everything will secure your files even further.
The 3-2-1 Backup rule goes as follows:
3 copies of anything you care about – Two isn’t enough if it’s important.
2 different formats – Example: Dropbox+DVDs or Hard Drive+Memory Stick or CD+Crash Plan, or more
1 off-site backup – If the house burns down, how will you get your memories back?
There you have it! If you want to ensure your data will last, follow these three steps.