- Encrypt sensitive documents before uploading them.
- Keep at least one local backup.
At some point, the CPU's built into phones will be powerful enough to handle most desktop applications for businesses without a noticeable performance hit. We're not quite there yet, though. Maybe in three or four more years, perhaps.
The application doesn't necessarily have to be installed locally on the device (think Google Apps or Office 365).
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I have had domains for private services such as databases(accepts request only from a list of IP's), file servers, and messaging services. I also use them for dynamic addresses.
My general rule of thumb as far as user id's: If your id is higher then mine I will give you toss it up to the member being young and ignorant about a topic when they overlook something simple. If there id is lower then mine they should be at least my age, and have a decent background on technology and its history as they lived it.
Why didn't you use subdomains (for example, database.yourdomain.com) as an alternative to purchasing & registering a full domain?