![]() For addition purposes - two Tested Bootable Clones each to separate external drives. A Time Machine Backup is very useful and can be used to Revert to Previous Working macOS. This comprises having 3 Backups using 2 methods and 1 Off Site incase of Theft, Loss or Natural Disasters. Point # 7 - Do I have a Rescue Plan In-Place. Point # 6A - To check for 32 bit Applications - a good application to use is Go64 - safe to use. ![]() ![]() These include Applications, Extensions and Drivers for any devices. Point # 6 - If upgrading from Mojave and earlier versions of macOS - Remember that Big Sur does not support anything 32 bit. Same goes for Third Party Drivers for Printer, Scanners etc. Check with the Developer for compatible Apps / extension or do they offer updates. Point # 5 - Are the installed Applications / Extensions compatible with Big Sur. Point # 4 - Does the intended computer qualify for the upgrade. Apple states 35.6 GB Empty Space but suggest 50 GB Point # 3 - What are the How to get old versions of macOS ie: Empty Space Requirements specific to the Big Sur. Otherwise - ones Privacy and Security touted by the VPN is suspect. Point # 2 A - Commercial VPNs should only be used if Mandated by Corporate Head Office for working remotely. The The Built in Security is all that is required. They are useless, unneeded, cause havoc and interfere with the normal operation of the OS and may even Corrupt the OS requiring a Reinstallation. Point # 2 - Are there any AntiVirus, Disk Cleaner, Optimizers, Un-installers, etc installed which should be removed as per Developers Instructions. They should be resolved prior to upgrading - they may carryover to Big Sur making the system unstable / unusable. Point # 1 - Are there pre-existing Unresolved Software Issues. The below points should all be consider Before attempting the upgrade. The most important is Due Diligence on the part of the User and is a Prerequisite for a smooth upgrade. There are several points to consider before attempting the upgrade to Big Sur.
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