light_pilgrim wrote in post #15580043
I wanted to ask people with experience, what do you use for back up and storage?
I have RAW files since 2008 in my lightroom and now I am close to one Tb.
I am a bit affraid that one day something will happen with the harddryve and I can lose everything, so I want to back up.
What do you suggest I do?
Purchase 1-2 more harddrives 2 Tb each and just make a copy?
Thanks for suggestions.
You are living on borrowed time. All hard drives will fail. It is a matter of "when", not "if".
If you have not backed anything up for 4+ years, you are indeed living on the edge.
Without pausing to develop your final backup strategy, go to your local Target/WalMart and pick up an external drive large enough to hold everything, and then make a copy.
Now. Quickly. Before the stores close. 
light_pilgrim wrote in post #15581989
Ideally I would love to back up the entire Lightroom Catalogue, a mirror copy. How to do it?
OK... are you back with everything now safely copied to a second drive? 
RAIDs and other mirroring programs are not backup archives. They are meant to reduce downtime in the event your working data drive fails.
They both share a common drawback when used as a backup system: they do not protect you against data loss caused by user error, virus or other malwear or software/hardware failure that corrupts the data. IOW, they will instantly propagate such failures/losses to your "backup".
A "proper" backup creates an archive, allowing you to go back in time to restore earlier versions, etc., of files.
There are many programs that do this, including CrashPlan.
A good backup system will cover you for
1. Fast recovery (on-site backup or RAID system)
2. Archival / versioning storage to allow you to go back in time
3. Protection against hardware failure (not just hard drive failure)
4. Protection against malware or other software failure
5. Protection against physical loss due to theft, fire, natural disaster, etc.
6. Be automatic, so there are not large time gaps in your backup system.
I don't use RAID, since minimizing downtime to less than it will take me to copy files from a local backup is not needed (for me), so I am not interested in the increased cost and complexity of trying to maintain a RAID system over time. YMMV.
I have my primary work computer with ~7TB of working drive space. Not all of this needs backing up, of course.
I have everything backed up to local drives (attached to a server computer on the network). This is handled automatically by CrashPlan. This will allow fast restore in the event I need it.
I have everything also backed up to the cloud, using CrashPlan. This provides an off-site backup in the event of physical loss (theft, fire, yadda, yadda).
The initial backup to the cloud took several weeks. I could have paid for a "seed" drive for CrashPlan to reduce that time, but I didn't. Incremental backups to the cloud are hardly noticeable, but then I have fairly fast internet service.
This system works for me. Again, YMMV in the specifics, but you do need to at least think about the 6 things I listed above.