Unfortunately, they limited the access to VS 2008 users and the files are downloaded on an as-needed basis during debugging.

不幸的是，微软只允许VS 2008的用户进行访问，而且，源码文件只能在调试过程中必要的时候被下载。

youdao

When the primary log files are all full, secondary log files are created on an "as-needed" basis until the maximum number of secondary log files has been created.

当主日志文件都写满时，就会“根据需要”创建辅助日志文件，直到创建了最大数量的辅助日志文件为止。

youdao

Other log files and dumps must be archived or purged on a regular basis manually.

对于其他的日志文件和转储，则必须定期手动地存档或者清除。

youdao

Congressional investigators want to determine whether the White House used sources other than the Secret Service list as a basis for its requests for the background files.

CNN: Senate Panel Looking At FBI Files Flap

Although tests showed no files were deleted from the phone, a complaint about this was upheld by the IPCC on the basis that the officers did not have the authority to look through the device.

BBC: Tees