I'm a longtime Windows user, though I've used an iPhone and have some basic computer experience. I'm considering buying a Mac and keeping it permanently offline as a backup for photos, documents, and other important files—something I could grab quickly during an evacuation.
Could I continue doing my normal work on my Windows laptop and periodically copy the updated files to the Mac with a USB drive? I'm especially wondering about Windows files such as Excel spreadsheets, whether they would open properly on macOS, and whether this setup would be as straightforward as it sounds. I'm open to better suggestions if a Mac isn't the most practical choice for offline storage.
4 Answers
An offline computer can work as part of an emergency kit, but it still needs maintenance. Turn it on periodically, charge it, check that the battery and drives work, install updates, and verify that the backups are readable. A device left untouched for years may not be ready when you need it.
For ordinary documents, photos, PDFs, and basic spreadsheets, moving files between Windows and macOS with a USB drive is generally easy. Excel exists on both platforms, but the Mac version may not fully support complicated Windows-only macros, unusual formulas, add-ins, or other advanced features. If those files are important, test copies on the Mac before relying on it.
A Mac seems unnecessarily expensive if the main goal is offline storage. An external SSD or two separate backup drives would be simpler, cheaper, and easier to replace. Keep one copy somewhere else so a fire, theft, or damaged drive doesn’t remove every backup.
If you specifically want macOS, try it first before making it your backup system. Windows files are usually fine, but the interface and file-management habits are different. Running Windows on some older Intel-based Macs was possible, while newer Macs have more limitations, so buying one solely to run Windows may not be worthwhile.
The same applies to any emergency equipment: it’s useful only if you occasionally test it and refresh anything that has expired or failed.