What do you think? Is it safe to put your information on your computer?
In the short term, yes, if it's encrypted. That said, any encryption method can be cracked but if it's going to take 200 years do you care?
Long term storage is another issue. Tapes are good for one to five years. The old 3.5" diskettes are good for at best about ten. Hard drives are good for five to ten years. CDs, DVDs and the like are good for ten to twenty.
So long term storage is becoming a major issue for many IT departments, especially government entities like schools, where sometimes people need to retrieve records from 30 or more years ago. For example, a couple of years ago I applied for a job and they wanted a copy of my high school diploma from 1968. Would a copy of my Bachelor's degree suffice? Nope, it had to be the HS diploma, and it took a few days of rummaging around before we found it. If I hadn't, the next place to go would be the high school.
This is an issue for military records, health records, land records, stock and financial records, and the list goes on of stuff that needs to be retrieved decades later. And if you're into history or genealogy, you want to retreive records from centuries ago. Long term preservation of bits 'n bytes is becoming an issue.